prevent remove self

removeUser.php

@@ -1 +1,63 @@
-{"error":"Unauthorized"}
+<?php
+session_start();
+header('Content-Type: application/json');
+
+$usersFile = 'users.txt';
+
+// Only allow admins to remove users
+if (
+    !isset($_SESSION['authenticated']) || $_SESSION['authenticated'] !== true ||
+    !isset($_SESSION['isAdmin']) || $_SESSION['isAdmin'] !== true
+) {
+    echo json_encode(["error" => "Unauthorized"]);
+    exit;
+}
+
+// Get input data from JSON
+$data = json_decode(file_get_contents("php://input"), true);
+$usernameToRemove = trim($data["username"] ?? "");
+
+if (!$usernameToRemove) {
+    echo json_encode(["error" => "Username is required"]);
+    exit;
+}
+
+// Prevent removal of the currently logged-in user
+if (isset($_SESSION['username']) && $_SESSION['username'] === $usernameToRemove) {
+    echo json_encode(["error" => "Cannot remove yourself"]);
+    exit;
+}
+
+// Read existing users from the file
+if (!file_exists($usersFile)) {
+    echo json_encode(["error" => "Users file not found"]);
+    exit;
+}
+
+$existingUsers = file($usersFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+$newUsers = [];
+$userFound = false;
+
+// Remove the user with the specified username
+foreach ($existingUsers as $line) {
+    $parts = explode(':', trim($line));
+    if (count($parts) < 3) {
+        continue;
+    }
+    $storedUser = $parts[0];
+    if ($storedUser === $usernameToRemove) {
+        $userFound = true;
+        continue; // Skip this user
+    }
+    $newUsers[] = $line;
+}
+
+if (!$userFound) {
+    echo json_encode(["error" => "User not found"]);
+    exit;
+}
+
+// Write the updated list back to users.txt
+file_put_contents($usersFile, implode(PHP_EOL, $newUsers) . PHP_EOL);
+echo json_encode(["success" => "User removed successfully"]);
+?>